In this file photo taken on October 19, 2017 Rohingya refugees who were stranded walk near the no man's land area between Bangladesh and Myanmar in the Palongkhali area next to Ukhia. Hundreds of desperate Rohingya Muslims still pour over the Myanmar border into Bangladesh camps every week, six months into the refugee crisis. (AFP/Munir Uz Zaman)

Myanmar's neighbours in Southeast Asia have urged the country to hold those responsible for the Rohingya crisis "accountable", Singapore said Tuesday, in a rare call for justice from within the region.

Around 700,000 Rohingya Muslims from Myanmar's western Rakhine state have fled across the border to Bangladesh since August last year following a military campaign that allegedly involved murder, rape, torture and razing villages.

The UN has accused Myanmar's military of committing "genocide" against the Muslim minority.

As global pressure has mounted over the atrocities, Myanmar formed an "Independent Commission of Enquiry", which is chaired by former Philippine deputy foreign minister Rosario Manalo -- but gave no details of the commission's remit, powers or how long it would take to complete its investigation.

Critics have blasted the commission for its toothlessness after Manalo said her commission will not be "blaming" or "finger pointing" anybody.

Singapore Foreign Minister Vivian Balakrishnan said he and his counterparts from the Association of Southeast Asian Nations (ASEAN) met on September 29 on the sidelines of the UN General Assembly in New York and discussed the situation in Rakhine.

"We expressed our grave concern with these alleged acts of violence that have led to loss of lives, injuries, destruction of homes and displacement of large numbers of people," he said in parliament.

"To be brutally honest, this is a man-made humanitarian disaster and something which should not be happening in this day and age."

He said the ministers told Myanmar that the commission "should be given a full mandate to investigate and to hold all those responsible fully accountable".

Myanmar's military has denied nearly all wrongdoing, justifying its crackdown as a legitimate means of rooting out Rohingya militants.

But after a fact-finding mission, the United Nations set up a panel to prepare indictments against Myanmar's army chief and five other top military commanders for crimes against humanity and genocide.

Much of Myanmar's majority Buddhist society regards the Rohingya as illegal immigrants from Bangladesh and has for decades systematically stripped them of their rights.

Balakrishnan noted that Myanmar cannot be compelled by ASEAN to act as the 10-nation grouping makes decisions by consensus, which effectively gives each member veto powers.

The bloc however can influence Myanmar through "persuasion, through transparency and keeping this on the agenda" of their annual meetings, he said.